I think your idea sounds about right. In the Original Army list book the Chaos dwarf had berserkers listed as a unit type. I don’t think they had shields… or armor at all… I’m pretty sure they were the counterpart to slayers exactly… I have a photocopy of the page somewhere… on it says:
"with their teeth filed to needle-sharp points, the Berserkers spit blood as they scream their praises to the Blood God. They are subject to all the rules for Berserkers given in WFB (p97)."
hand weapon, oh, it does say they can upgrade to having shields… can have an additional hand weapon, double handed weapon, or throwing axe or spear…